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tospo
++ for GD::Graph. I use that a lot to generate quick and dirty plots for scientific data analysis. They are not pretty but very easy to generate and I find <a href="http://search.cpan.org/dist/GD-Tiler/lib/GD/Tiler.pm">GD::Tiler</a> a very useful addition to the toolbox. It allows you to quickly aggregate lots of plots in a single image, which often makes it easier to compare them.
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